{
 "ocl_version": "0.1.0",
 "name": "Chemin du Fournel",
 "slug": "chemin-du-fournel",
 "confidence": "B",
 "reported_claims": [],
 "ladder": [
  {
   "window_m": 2.0,
   "max_gradient_pct": 24.864865073476494,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1183.0,
   "end_distance_m": 1185.0,
   "start_elevation_m": 661.2183789358096,
   "end_elevation_m": 661.7156762372791,
   "min_gradient_pct": -5.804540779740819
  },
  {
   "window_m": 3.0,
   "max_gradient_pct": 22.899594458795036,
   "diagnostic": true,
   "flags": [],
   "start_distance_m": 1063.0,
   "end_distance_m": 1066.0,
   "start_elevation_m": 641.5284292803976,
   "end_elevation_m": 642.2154171141615,
   "min_gradient_pct": -4.679653327722614
  },
  {
   "window_m": 5.0,
   "max_gradient_pct": 22.092762699835475,
   "diagnostic": false,
   "flags": [],
   "start_distance_m": 1061.0,
   "end_distance_m": 1066.0,
   "start_elevation_m": 641.1107789791697,
   "end_elevation_m": 642.2154171141615,
   "min_gradient_pct": -2.7048400565445263
  },
  {
   "window_m": 10.0,
   "max_gradient_pct": 21.687101446696033,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1063.0,
   "end_distance_m": 1073.0,
   "start_elevation_m": 641.5284292803976,
   "end_elevation_m": 643.6971394250672,
   "min_gradient_pct": -1.1574561536656347
  },
  {
   "window_m": 20.0,
   "max_gradient_pct": 21.42457618265098,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1061.0,
   "end_distance_m": 1081.0,
   "start_elevation_m": 641.1107789791697,
   "end_elevation_m": 645.3956942156999,
   "min_gradient_pct": -0.7445966051642472
  },
  {
   "window_m": 25.0,
   "max_gradient_pct": 21.2579025810046,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1056.0,
   "end_distance_m": 1081.0,
   "start_elevation_m": 640.0812185704488,
   "end_elevation_m": 645.3956942156999,
   "min_gradient_pct": -0.5871835954471862
  },
  {
   "window_m": 50.0,
   "max_gradient_pct": 20.609870746988236,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1053.0,
   "end_distance_m": 1103.0,
   "start_elevation_m": 639.4602851442454,
   "end_elevation_m": 649.7652205177395,
   "min_gradient_pct": -0.20245934094327822
  },
  {
   "window_m": 100.0,
   "max_gradient_pct": 19.893846659532983,
   "diagnostic": false,
   "flags": [
    "canopy_or_structure"
   ],
   "start_distance_m": 1042.0,
   "end_distance_m": 1142.0,
   "start_elevation_m": 637.4606586292875,
   "end_elevation_m": 657.3545052888205,
   "min_gradient_pct": 0.8354309580462314
  }
 ],
 "shape": {
  "ascent_concentration": 0.418,
  "concentration_window_frac": 0.25,
  "longest_pitch_10pct_m": 131.0,
  "shape_class": "sustained"
 },
 "length_m": 1232.0573742931574,
 "start_elevation_m": 582.4868235131827,
 "end_elevation_m": 665.3728936615927,
 "endpoint_gain_m": 82.88607014841,
 "overall_gradient_pct": 6.727452136387925,
 "accumulated_ascent_m": 83.49975334892213,
 "window_maxima": {
  "max_5m": {
   "gradient_pct": 22.092762699835475,
   "start_distance_m": 1061.0,
   "end_distance_m": 1066.0,
   "midpoint_distance_m": 1063.5,
   "start_elevation_m": 641.1107789791697,
   "end_elevation_m": 642.2154171141615,
   "start_xy": [
    923202.4914151824,
    6454943.560552999
   ],
   "end_xy": [
    923207.2829267882,
    6454942.131771515
   ]
  },
  "max_10m": {
   "gradient_pct": 21.687101446696033,
   "start_distance_m": 1063.0,
   "end_distance_m": 1073.0,
   "midpoint_distance_m": 1068.0,
   "start_elevation_m": 641.5284292803976,
   "end_elevation_m": 643.6971394250672,
   "start_xy": [
    923204.4080198247,
    6454942.9890404055
   ],
   "end_xy": [
    923213.9910430366,
    6454940.131477437
   ]
  },
  "max_20m": {
   "gradient_pct": 21.42457618265098,
   "start_distance_m": 1061.0,
   "end_distance_m": 1081.0,
   "midpoint_distance_m": 1071.0,
   "start_elevation_m": 641.1107789791697,
   "end_elevation_m": 645.3956942156999,
   "start_xy": [
    923202.4914151824,
    6454943.560552999
   ],
   "end_xy": [
    923221.6271106903,
    6454937.747110941
   ]
  },
  "max_25m": {
   "gradient_pct": 21.2579025810046,
   "start_distance_m": 1056.0,
   "end_distance_m": 1081.0,
   "midpoint_distance_m": 1068.5,
   "start_elevation_m": 640.0812185704488,
   "end_elevation_m": 645.3956942156999,
   "start_xy": [
    923197.6999035764,
    6454944.989334484
   ],
   "end_xy": [
    923221.6271106903,
    6454937.747110941
   ]
  },
  "max_50m": {
   "gradient_pct": 20.609870746988236,
   "start_distance_m": 1053.0,
   "end_distance_m": 1103.0,
   "midpoint_distance_m": 1078.0,
   "start_elevation_m": 639.4602851442454,
   "end_elevation_m": 649.7652205177395,
   "start_xy": [
    923194.7786226199,
    6454945.5999743175
   ],
   "end_xy": [
    923242.8130777519,
    6454931.829627914
   ]
  },
  "max_100m": {
   "gradient_pct": 19.893846659532983,
   "start_distance_m": 1042.0,
   "end_distance_m": 1142.0,
   "midpoint_distance_m": 1092.0,
   "start_elevation_m": 637.4606586292875,
   "end_elevation_m": 657.3545052888205,
   "start_xy": [
    923183.8371703265,
    6454945.514158706
   ],
   "end_xy": [
    923280.7981525223,
    6454923.026959682
   ]
  }
 },
 "window_minima": {
  "min_5m": {
   "gradient_pct": -2.7048400565445263,
   "start_distance_m": 1185.0,
   "end_distance_m": 1190.0,
   "midpoint_distance_m": 1187.5,
   "start_elevation_m": 661.7156762372791,
   "end_elevation_m": 661.5804342344519,
   "start_xy": [
    923322.5084793755,
    6454912.574752556
   ],
   "end_xy": [
    923327.3585173817,
    6454911.359379635
   ]
  },
  "min_10m": {
   "gradient_pct": -1.1574561536656347,
   "start_distance_m": 660.0,
   "end_distance_m": 670.0,
   "midpoint_distance_m": 665.0,
   "start_elevation_m": 619.7640149903523,
   "end_elevation_m": 619.6482693749857,
   "start_xy": [
    923286.874103718,
    6454664.071772651
   ],
   "end_xy": [
    923296.3108900255,
    6454667.02304066
   ]
  },
  "min_20m": {
   "gradient_pct": -0.7445966051642472,
   "start_distance_m": 651.0,
   "end_distance_m": 671.0,
   "midpoint_distance_m": 661.0,
   "start_elevation_m": 619.7887428443132,
   "end_elevation_m": 619.6398235232804,
   "start_xy": [
    923278.0287635919,
    6454662.410460503
   ],
   "end_xy": [
    923297.1908942459,
    6454667.498006524
   ]
  },
  "min_25m": {
   "gradient_pct": -0.5871835954471862,
   "start_distance_m": 645.0,
   "end_distance_m": 670.0,
   "midpoint_distance_m": 657.5,
   "start_elevation_m": 619.7950652738475,
   "end_elevation_m": 619.6482693749857,
   "start_xy": [
    923272.1318701745,
    6454661.30291907
   ],
   "end_xy": [
    923296.3108900255,
    6454667.02304066
   ]
  },
  "min_50m": {
   "gradient_pct": -0.20245934094327822,
   "start_distance_m": 622.0,
   "end_distance_m": 672.0,
   "midpoint_distance_m": 647.0,
   "start_elevation_m": 619.7607884425549,
   "end_elevation_m": 619.6595587720833,
   "start_xy": [
    923249.4806494033,
    6454658.4415433835
   ],
   "end_xy": [
    923298.0708984662,
    6454667.972972387
   ]
  },
  "min_100m": {
   "gradient_pct": 0.8354309580462314,
   "start_distance_m": 594.0,
   "end_distance_m": 694.0,
   "midpoint_distance_m": 644.0,
   "start_elevation_m": 619.2274958094422,
   "end_elevation_m": 620.0629267674884,
   "start_xy": [
    923223.9688383897,
    6454668.587439868
   ],
   "end_xy": [
    923301.2238257639,
    6454686.2194832945
   ]
  }
 },
 "diagnostic_window_maxima": {
  "max_2m": {
   "gradient_pct": 24.864865073476494,
   "start_distance_m": 1183.0,
   "end_distance_m": 1185.0,
   "midpoint_distance_m": 1184.0,
   "start_elevation_m": 661.2183789358096,
   "end_elevation_m": 661.7156762372791,
   "start_xy": [
    923320.568464173,
    6454913.060901725
   ],
   "end_xy": [
    923322.5084793755,
    6454912.574752556
   ]
  },
  "max_3m": {
   "gradient_pct": 22.899594458795036,
   "start_distance_m": 1063.0,
   "end_distance_m": 1066.0,
   "midpoint_distance_m": 1064.5,
   "start_elevation_m": 641.5284292803976,
   "end_elevation_m": 642.2154171141615,
   "start_xy": [
    923204.4080198247,
    6454942.9890404055
   ],
   "end_xy": [
    923207.2829267882,
    6454942.131771515
   ]
  }
 },
 "diagnostic_note": "Windows <=3 m are at raster-noise scale (1-sigma raster noise alone is roughly +/-7 pp at 2 m and +/-5 pp at 3 m on a 1 m DTM). Diagnostic use only: never a headline or ranking value.",
 "quality_summary": {
  "overhead_obstruction": {
   "obstruction_threshold_m": 2.0,
   "obstructed_fraction": 0.083,
   "obstruction_max_height_m": 18.49,
   "flagged_windows_m": [
    10,
    20,
    25,
    50,
    100
   ]
  },
  "review": [],
  "extent": [
   "may_start_earlier",
   "may_continue_beyond_end"
  ]
 },
 "provenance": {
  "analysis_version": "0.1.0",
  "sample_interval_m": 1.0,
  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
   5.0,
   10.0,
   20.0,
   25.0,
   50.0,
   100.0
  ],
  "diagnostic_windows_m": [
   2.0,
   3.0
  ],
  "elevation_crs": "EPSG:2154",
  "elevation_resolution_m": 0.5,
  "elevation_tiles": [
   "data/cache/fr/ign-lidarhd_dtm_E922-N6454_0m5.tif",
   "data/cache/fr/ign-lidarhd_dtm_E923-N6454_0m5.tif"
  ],
  "calculated_at": "2026-09-17T04:08:41+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/block-batch-fr-alps2.osm.pbf",
  "osm_snapshot": "",
  "run_id": "fr-alps2",
  "elevation_provider": "IGN LiDAR HD MNT 0.5 m",
  "elevation_licence": "Licence Ouverte / Open Licence 2.0 (Etalab) \u2014 \u00a9 IGN, LiDAR HD (MNT/MNS), data.geopf.fr; reproduction autoris\u00e9e avec mention de la source et de la date",
  "elevation_dataset": "LiDAR HD \u2014 MNT (sol) et MNS (surface), 0,50 m (Institut national de l'information g\u00e9ographique et foresti\u00e8re), RGF93 / Lambert-93 EPSG:2154, altitudes IGN69",
  "elevation_vertical_datum": "IGN69",
  "elevation_tile_ids": [
   "E922-N6454",
   "E923-N6454"
  ],
  "elevation_blocks": [
   "21LHD6PM@2025-03-25"
  ],
  "ign_dalles": [
   "LHD_FXX_0922_6455_MNT_O_0M50_LAMB93_IGN69",
   "LHD_FXX_0923_6455_MNT_O_0M50_LAMB93_IGN69"
  ],
  "ign_missions": [
   "21LHD6PM"
  ],
  "ign_editions": [
   "2025-03-25"
  ],
  "ign_dsm_edition": {
   "LHD_FXX_0922_6455_MNT_O_0M50_LAMB93_IGN69": "2025-03-25",
   "LHD_FXX_0923_6455_MNT_O_0M50_LAMB93_IGN69": "2025-03-25"
  },
  "climb_origin": "discovered",
  "structure_own_ways": 12,
  "carriageway": {
   "stations": 56,
   "stations_resolved": 56,
   "width_median_m": 6.75,
   "width_p10_m": 2.5,
   "width_min_m": 1.0,
   "width_max_m": 12.0,
   "bounded_share": 0.268,
   "unbounded_share": 0.732,
   "confidence_median": 0.0,
   "width_median_bounded_m": 5.75,
   "window_m": [
    1056.0,
    1081.0
   ],
   "width_at_max25_m": 2.5,
   "window_stations": 7,
   "single_track": false,
   "single_track_rule": "PROVISIONAL (2026-09-15): width_p10_m <= 3.0 m with bounded_share >= 0.6; recorded, not a rule",
   "status": "ok",
   "source": "dtm",
   "station_m": 25.0,
   "window_station_m": 5.0,
   "halfwidth_m": 6.0,
   "step_m": 0.25,
   "level_tol_m": 0.12,
   "break_min_m": 0.3,
   "stations_failed": 0,
   "hedge_to_hedge": {
    "stations": 56,
    "stations_resolved": 56,
    "width_median_m": 6.5,
    "width_p10_m": 1.0,
    "width_min_m": 0.5,
    "width_max_m": 12.0,
    "bounded_share": 0.714,
    "unbounded_share": 0.286,
    "confidence_median": 1.0,
    "width_median_bounded_m": 4.5,
    "window_m": [
     1056.0,
     1081.0
    ],
    "width_at_max25_m": 1.5,
    "window_stations": 7,
    "status": "ok",
    "source": "dsm",
    "station_m": 25.0,
    "window_station_m": 5.0,
    "halfwidth_m": 6.0,
    "step_m": 0.25,
    "level_tol_m": 0.5,
    "break_min_m": 0.3,
    "stations_failed": 0
   }
  },
  "license": "ODbL-1.0",
  "license_url": "https://howsteep.org/licensing"
 },
 "area": {
  "place": "Saint-Martin-d'Uriage",
  "county": "Is\u00e8re",
  "source": "OpenStreetMap administrative boundaries (\u00a9 OpenStreetMap contributors, ODbL)"
 }
}